实现看门狗定时器的计时和其中断 程序运行成功之后， 超级终端上将显示： WatchDog Timer Test Example 10 seconds: 1s 2s 3s 4s 5s 6s 7s 8s 9s 10s O.K. End.-The timing watchdog timer and interrupt After the success of the program is running, HyperTerminal will be